Slow External Drive Ejecting
The similar problem is described in this topic.
After upgrading to OS X Mavericks, I noticed ejecting external drives (memory cards, flash drives, etc.) became taking too much time. Instead of 1–2 seconds in Mountain Lion, it now takes over 10 seconds to eject a drive in Mavericks. The problem occurs in 10.9.1 on late 2011 MacBook Pro which I upgraded from Mountain Lion.
At the same time, mid 2010 white MacBook, after clean Mavericks installing, ejects drives pretty fast despite older hardware.
MacBook Pro (13-inch Late 2011), OS X Mavericks (10.9.1)